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United States Patent | 5,297,431 |
White | March 29, 1994 |
A sample preparation method and apparatus is provided which is capable of automatic operation over a broad range with improved accuracy and precision, and which is capable of sampling with improved accuracy and flushing without operator intervention. A pair of syringes are used to measure large and small volumes of components, respectively, and can be operated automatically using a processor to prepare samples. Further, the method and apparatus incorporate a solvent selector valve which permits various solvents to be selected as required to prepare a particular sample. Automatic flushing of the apparatus is also provided after the preparation of each sample.
Inventors: | White; Landy B. (Sunol, CA) |
Assignee: | Thermo Separation Products (California) Inc. (Fremont, CA) |
Appl. No.: | 891703 |
Filed: | June 1, 1992 |
Current U.S. Class: | 73/864.22 |
Intern'l Class: | G01N 035/06 |
Field of Search: | 73/864.21-864.25,864.81,864.83-864.85,864.87,863.72,863.73,864.22 422/70,63,81-82.13,100 |
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